handle ondblclick properly

[akosyakov]

Our code is written with the assumption that onclick and ondblclick events are happening exclusively. Which is not true and they fired together: facebook/react#3185

We should reconsider such handlers. We should be very careful with solving it though, since using timeouts make an event look as not triggered by a user and cause failures for calling DOM apis, in the case if a dbl click event never happens.

It is reproducible by trying to open the file with the dbl click. It will be opened, but you will see there is an additional empty title next to the editor caused by a race condition of opening an editor (dbl click) and editor preview (click) at the same time.